Containment of acyclic conjunctive queries with negated atoms or arithmetic comparisons
We study the containment problem for conjunctive queries (CQs ) expanded with negated atoms or arithmetic comparisons. It is known that the problem is View the MathML source-complete [14] and [16]. The aim of this article is to find restrictions on CQs that allow for tractable containment. In parti...
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| 格式: | Journal article |
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Elsevier
2016
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